Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d59d9bc83ea8a5d…

MALICIOUS

PDF

70.9 KB Created: 2021-05-10 00:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84cf7432efdfe4c14581c8ad6474ef8a SHA-1: 084ab800fb24a789d0d80639ddb4db8e5fcf65d1 SHA-256: 7d59d9bc83ea8a5dc7da0ea67a6be12cd3333d8ab924c5576453307eb7f4b8ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/6402f69dfa966a70b13904e7bd694ac3/67385008752.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076bbd2ee149---97936549730.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/r3g24ecreh7m8i9ihn1ini48qh/fisinuwuzezatezelelenul.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9301c41c6---naziwamupenizesomemomovod.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085be9556175---detufopemupi.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/5f0918c62d5bc3f657857de7b7cff396/tedaxafejodigumu.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8dda844d4---tuwinufeful.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/99ecf2202c391b341964e0d2441d476c/74126878292.pdf
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c5b6eae1---22243708389.pdf
    • http://barcelonasixtytwo.com/userfiles/file/nikezujelozutidiwuliw.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba4d43c997---xanatavibofevitajorimeduz.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16085782ae267d---25576387790.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/5d01abf7f5b0ede19101a36e2909b5cd/44940528894.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e590e7db55---wejevexeja.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/48be80ae55a5a427cd8c15a07960cceb/nemesorir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cell+apoptosis+pdf
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cece.bin
56f9933256a596421e0b91681c68ac15b7aad0e7d4f355a9fb69dba63bf62d81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCECE 4844 bytes
font_01_sfnt_off0000df5a.bin
aea7923102975af51d0183f6dddc1c3362077fa88e55271598558b01c20548af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5A 10160 bytes
font_02_sfnt_off00010261.bin
2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 16060 bytes

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